Need help in stepwise function

Question

sagar pokhrel 2014-9-16

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https://ww2.mathworks.cn/matlabcentral/answers/155086-need-help-in-stepwise-function

评论： Saagar 2014-9-17

r=[0.5,1,1.5....5]; theta= linspace(0,2*pi,73); [theta,r]=meshgrid(theta,r); [x11,y11]=pol2cart(theta,r); x1= x11(:);

% I have a function z whose input needs to be x and y between [-1,1] so I need to change x and y both %such that for x1>1, x=1, x1<-1, x=-1 and -1<=x1<=1, x=x1 % i tried this for k=1:length(x1) if x1(k)<-1 x(k)=-1 else if x1(k)>=-1 && x1(k)<= 1 x(k)=x1 else if x1(k)>1 x(k)=1 end end

z= 1.3249-.004937*x+5.43243*x.^2-1.153*x.*3+4.2693*y.^6 % Repeating same for Y as well. when I run this i get In an assignment A(I)=B and I must be same. Is anyone able to help me. Thanks in advance

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Answer 1

Saagar 2014-9-16

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https://ww2.mathworks.cn/matlabcentral/answers/155086-need-help-in-stepwise-function#answer_151933

在 MATLAB Online 中打开

for k=1:length(x1)
  if x1(k)<-1
      x(k)=-1
  elseif x1(k)>=-1 && x1(k)<= 1
      x(k)=x1(k)
  else  x1(k)>1
      x(k)=1
  end
end

Sorry, didn't realize I didn't have the "code" option selected, should be easier to read now. The problem you are getting is because you are currently trying to make x(k)=x1, but x1 is currently a vector, and you only need the corresponding element x1(k).

Hope this helps.

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sagar pokhrel 2014-9-17

I used same for x and y and ran the code but it just gave me single output instead of length (x1)( 730). How do i run code for each 830 x and corresponding Y to get 830 output

Thanks in advance

Saagar 2014-9-17